first可用作形容词或副词,有时还可用作代词;而at first作为介词短语,只起副词用作用(在句中用作状语)。如: First class is the most expensive way to travel. 坐头等舱是最贵的旅行方式。(first为形容词,在句中用作定语) This is the first time I have heard of suc...
The next thing he saw was smoke rising from behind the house. 随后,他看见的是,烟正从屋子后面升起。 4. to do还是to doing to有时是不定式符号,有时是介词,所以英语有时用to do,有时用to doing。对于许多同学来说,to do容易理解,但 to doing 则很容易搞错。从中...
更多内容请点击：初中英语知识点总结:初中英语语法——介词后接宾语的四个易错点